<div class="weui-pull-to-refresh-layer">
  <div class='pull-to-refresh-arrow'></div>
  <div class='pull-to-refresh-preloader'></div>
  <div class="down">下拉刷新页面</div>
  <div class="up">释放刷新</div>
  <div class="refresh">正在刷新</div>
</div>